Fluid operated apparatus for printing binary-coded information



' March 7,1967

Filed April 21, 1965 W. TAUBERT FLUID OPERATED APPARATUS FOR PRINTING BINARY-CODED INFORMATION 7 Sheets-Sheet 1 March 7, 1967 w. TAUBERT FLUID OPERATED APPARATUS FOR PRINTING BINARY-CODED INFORMATION Filed April 21; 1965 7 Sheets-Sheet 2 A y 2 IYIIIH 00 m "4! L- .I m F F B IN VENTOR Wee/v52 74 05527 ATTYSv March 7, 1967 w. TAUBERT 3,307,675

FLUID OPERATED APPARATUS FOR PRINTING BINARY-CODED INFORMATION Filed April 21, 1965 7 Sheets-Sheet 5 Fig.3

NVENTOR Werner '7Zzuber/ B JVZQ/ a? ATTYS March 7, 1967 w. TAUBERT 3,307,675

FLUID OPERATED APPARATUS FOR PRINTING BINARY*CODED INFORMATION Filed April 21, 1965 'T.Sheets-Sheet 5 INVENTOR Wee/m5? 7205:?7

BY 96x02 ATTYS March 7, 1967 I w. TAUBERT 3,307,675 FLUID OPERATED APPARATUS FOR PRINTING BINARY-CODED INFORMATION Filed April 21, .1965 7 Sheets-Sheet 7 -Fig.14

WazA/ee fauaszr ATTYS INVENTOR I United States Patent Ofiice 3,307,675 Patented Mar. 7, 1967 20 Claims. (c1. 197-15 The invention relates to an apparatus for the printing of binary coded information symbols, in which the energy required for decoding and the printing of a symbol is transmitted by means of fluid media under pressure.

Both in teletype technology and in typewriter technology devices have become known which utilize for the transmission of the printing energy, a pressure drop in a fluid media. While these systems, in which type levers are used throughout for the printing of a symbol, realize a power transmission by means of fluid media, they are incapable of providing the advantages of a compactly formed, maintenance-free, trouble-free and noiseless structural unit of high speed.

It is the problem of the invention to produce an apparatus having these advantageous properties.

According to the invention such an apparatus is characterized by the feature that a type carrier, on which there are arranged symbols to be printed in one or in two coordinate directions, is coupled directly or over a translation lever with one or two adjustable slides which selectively move the type carrier in the coordinate directions of the symbols arranged thereon by means of one each of several piston pairs, corresponding in their number to the number of symbols arranged in the corresponding coordinate of the type carrier, and slid-able by action of a fluid media under pressure, conducted over adjustable decoding element in the direction of fixed stops (or over tion opening the pressure transmission path for the fluid media to an allocated piston pair, which control piston, preferably after completion of its functional assignment, is restorable by further fluid means into its rest position.

According to another further development of the invention, the decoding elements are settable indirectly by fluid media controllable by receiver sliders, which are slidable, preferably, by means of the fluid media under pressure into the effective range of receiver magnets. Thereby, the control paths are considerably enlarged as compared to known devices, although for receiver elements, a short Working stroke is required.

In a preferred form of construction, according to the invention, in connection with a hole-punch mechanism, the punch stamps are actuable over pistons which select the selection members, by means of-fluid media under pressure, and which are controlled over the receiver sliders. According to another preferred form of construction the punch stamps are actuatable over pistons which select the selection members, by means of fluid media under pressure, which are controlled over the decoding slider.

,be made active in proper time sequence for the individual actuatable parts, for example, receiver slider, decoding elements and pistons for the printing or punching of a symbol.

Such rotary slide valve is. preferably actuatable by a drive motor over a blocking slide through an electromagnet excitable by impulses and over a coupling which is actuatable by fluid media under pressure through a valve controllable by the electromagnet. Further, there are arranged advantageously, on the one hand, a pump device for the generation of the working pressure of the fluid media for the control pistons, for the piston pair operating the displacement of the type carrier, for the piston actuating the printing and, on the other hand, a pump device for the generation of the working pressure of the fluid media for the remaining functions.

According to a further development of the subject matter of the invention, with respect to a device for adjusting the type roller in rotation direction, there are arranged a plurality of pistons, the number of which corresponds to the number of symbols disposed on the circumference of the type roller, with the pistons being individually selectable over the decoding elements and actuated by the fluid media under pressure, pins being arranged in circular form around the shaft of the type roller, actuatable over a start-stop coupling and disposed in the swinging range of an attachment which is fixedly mounted on the shaft of the 'type roller.

Details of the invention will appear from the examples of construction illustrated in the drawings, in which:

FIG. 1 illustrates decoding and control system actuation of a slide, over which a type carrier with a plurality of symbols thereon is shiftable;

FIG. 2 illustrates an end view of the slide member;

FIG. 3 illustrates further media decoding system for the control of the slide apparatus (not shown in this figure) for the shifting of the type carrier;

FIG. 4 illustrates a control arrangement for a punch stamp;

FIG. 5 illustrates a control arrangement for a printing hammer;

FIG. 6 illustrates a control system for the paper advance in a strip slider;

FIG. 7 illustrates the start-stop mechanism for the rotary slide valve;

FIG. 8 illustrates a plan view of the rotary slide valve in the region of the locking pawl therefor;

FIG. 9 illustrates an arrangement for the transmission of the longitudinal movement of the slide according to FIG. 1 into an axial movement of the type roller;

FIG. 11 illustrates a time-path diagram of the individual actuation parts of the apparatus and the arrangement of the control channels for the individual actuating parts on the rotary slide valve;

FIG. 12 illustrates an arrangement of a piston-actuating slide for setting the type carrier provided with shock absorbing means of the rotary movement of a type roller, making use of a friction coupling; and

FIG. 14 is a hydraulic diagram for the apparatus illustrated in FIG. 12;

Referring to FIG. 1, oil is supplied, under pressure, from a supply tank 1, through a gear type pump 2, to a rotary slide valve actuatable by the receiver shaft 3. Inserted in the oil line between gear pump 2 and rotary slide valve is an oil accumulator 5 with a pressure limiting valve. Through the rotary slide valve 4, the oil under pressure, is distributed in correct time sequence to the individual operating parts of the apparatus.

Upon reception of a symbol component which consists, in its coded form, of three symbol steps, magnet armatures 6 are disposed adjacent the corresponding receiver magnets 7 by the action of springs 9 through receiver slides 8.

If the electromagnets 7 are energized during this time by a current step, the cooperable armatures 6 and there with, the corresponding receiver slides 8 are held in the shifted position. Any slide 8 and magnet armature 6, whose cooperable magnet is not energized, following release of oil under pressure, as a result of operational rotating of the rotary slide valve 4 for displacement or shifting of the corresponding receiver slide 8 will take place in opposition to the force of the spring 9, returning such slide 8 to starting position. Each of the receiver slides 8 thus serves as a control valve for the oil feed and oil return of one of three decoding slides 10. When the receiver slides 8 are in the positions so set, oil under pressure is then released over rotary slide valve 4 to effect a shifting of the decoding slides 11) with the direction of displacement of the individual decoding slides being controlled by the position of the receiver slides 8. In the present case illustrated in FIG. 1, since all the magnet armatures 6 have dropped from their corresponding magnets 7, all three'decoding slides 10 are shifted into their left-hand position. The displaced oil expelled by the decoding slides is conducted back over the corresponding receiver slide 8 into the oil tank 1.

After the setting operation of the three decoding slides 10, the oil standing under pressure, following actuation of the rotary slide valve 4, is conducted to the decoding lines 11. In the position of the slides 11?, illustrated in the figures in only one of the decoding lines, the line at the extreme left, can the pressure oil penetrate to one of the eight control pistons 12 and act thereon. The oil channels to the other seven control pistons are blocked by at least one of the three decoding slides. The left hand control piston 12 is now shifted by the oil pressure out of its rest position into the illustrated working position. To the middle six of the control pistons 12 there are in each case at least one piston pair counteracting in the region of the circumference on a slide 13, and for each of the left and right control pistons 12 there are allocated pistons 15, 16 acting centrally on the slide 13. The actuation path of the piston pairs 14 is limited by stops 17 arranged in a staggered pattern. The stops 17 have the same width as the slide 13, the latter being shift able into the end position by the pistons and 16, respectively. In the position illustrated in the drawing, the feed channel for the pressure oil is opened by the lefthand control piston 12. When the pressure oil is released by the rotary slide valve 4 to this channel, the oil pressure over the left-hand control piston 12 becomes active on the piston 15 and moves the latter into the extreme right position.

The return oil of the pistons arranged at the right side of the slide 13 can escape over the control piston 12, situated in rest position, into the oil supply tank 1. After the conclusion of the setting of the slide 13, the control piston 12, situated in working position, is returned by pressure oil to it rest position. Simultaneously over the control slide 4, pressure oil is released to the piston 18 of the pressure device illustrated in FIG. 5, through the displacement of which the printing hammer 19 is propelled in the direction of the paper 20 and the type roller 21. Shortly before the symbol printing, the movement of the piston is restricted by a stop 22 on the casing guide 23 and the printing hammer 19 continues the rest of its movement to the printing location in free flight. The return movement of the printing hammer 19 and of the piston 18 from the printing location is accomplished by a spring 24.

If through one of the middle control pistons 12, the feed channel for the pressure oil to one of the piston pairs 14 is opened, then through the oil pressure the two pistons move to the projection 17 lying between them and one of the two pistons, on whose side the slide 13 happens to be at this moment, moves the slide 13 into overlying position with the projection 17. The other piston prevents a further movement of slide 13. In this manner the slide 13 is fixed in a predetermined position by the piston pair 14. The piston pairs 14 are so arranged that they may, on the one hand bear on the steps 17 and, on the other hand, on the slide 13 with the same bearing surface. 4

FIG. 3 illustrates a receiver decoding system in which the decoding slides 10 are direetlly shiftable by the magnet armatures of the receiver magnets 7. The setting, as desired, of the control pistons 12 as well as their restoration take place simultaneously over a single control channel in the rotary slide valve 4. So that this may be possible, there is arranged in the channel path between the last decoding slide 10 and eaeh of the Control pistons 12 a restrictive channel 25, and moreover, the sur'faces on which the pressure oil ean act in the shifting of the pistons 12 are of different size. The active surface for the ressure oil bringing about the return movement of a piston 12 finds a considerably smaller thrust surface than the pressure oil controlled through the decoding slide 11} for a certain control piston 12 to be set. Since the pressure in the res ure lines is a rosirnatelyeqnal, the control slide 12 selected by the decoding slides is shifted. It only theresetting on ss on the contrdl pistons 12, these are then returned, iii which pr eesstns expelled oil escapes at the side toward the decdding slides over the restricted channels 25 into the supply tank 1; The further setting of the slide 13 follows analogously to the system described in connection 'with FIG. 1.

FIG. 4 illustrates an additional device for the apparatus of FIG. 1, which makes it possible to operate a holepunch device simultaneously with the printing device. For this purpose the decoding slides 10 are constructed at their ends as control slides, which ontrolthe feed of pressure oil to the pistons 27 operating the paneh stamp 26. The control of the punching times and restoring times is accomplished over the rotary slide valve 4.

FIG. 6 illustrates a hydraulically driven advance device for a slidahle strip. If the paper strip 20 is to be advanced in the dire'etien of the arrow, through the rotary slide valve 4, the presur'e dil isreleased over piston 28 and piston 29. The strip is clamped ecurely by the piston 28 while the advance movement of the paper strip 20 by means of the gripper 30 is effected by the pi'stoii 29. After completion of the advance movement the pistons 28 and 29 are released and through the spring 31, the piston 28 releases the paper strip. Thereupon, over the rotary slide valve 4, the pressure oil is supplied to pistons 32 and 33. Piston 33 clamps the paper strip 20 and thereby prevents return movement thereof while the piston 32 effects the return movement of the gripper 30. The spring 34 thereupon returns the piston 33 to its rest position.

FIGS. 7 and 8 illustrate the start-stop mechanism for the control of rotary slide valve 4, which in turnopens and closes the passage channels for the pressure oil to the individual actuating elements of the entire system. rotor 41 is driven by a drive unit (not shown) with uniform speed. A rest current holds an armature in working position by an electromagnet 43, the free end of the armature 42 being disposed in mechanical working connection with a control valve 44, a piston 46 acted upon by a spring 45 on the one hand and oil pressure controlled by the rotary slide valve 4, on the other hand,

and a holding pawl 47 for the rotary slide valve 4. In rest position of the rotary slide valve 4, the oil pressure acts on the piston 46. However, if the rest current for the electromagnet 43 is briefly interrupted, the piston 46, the valve 44 and the armature 42 move in response to the oil pressure, whereby oil pressure is supplied to the cage 41 through the valve 44 and the armature 42 drops away from the electromagnet 43. The oil pressure pass ing into the chamber of the rotor 41 presses a coupling disk 48 arranged on the axis of the rotary slide valve 4,

' channels for the return oil.

which is released by the ratchet pawl 47 is turned. Shortly after the commencement of the turning of the slide 4, the electromagnet is again energized by the rest current. The force thereby generated in the electromagnet does not, however, sufiice to return the fallen-off armature 42 against the force brought about by the oil pressure acting on the piston 46. Only shortly before completion of the first rotary movement, when the oil pressure is interrupted by the rotary slide valve 4 for the piston 46, is the magnet armature 42 with the aid of the force of spring 45 returned to the electromagnet which then holds it in working position. The valve 44 is then again closed and holding pawl 47 falls back into the rotary slide valve 4. The oil expelled up to the impact there absorbs the shock.

FIG. 9 illustrates a slide 13, movable inthe direction of the arrow, which is operable to move a transmission lever 35, which carries a gear sector 37 meshed with a gear wheel 36 and then shift a type roller 21 arranged on the shaft of the gear wheel. FIG. 10 illustrates, besides a side view of the apparatus for the actuation of the rotary movement of the type roller 21, a slide 13 which, over a translation lever 38, displaces a carrier 39 for the type roller 21, mounted longitudinally slidable on a partial axle 40, and thereby moves the type roller 21 in axial direction.

FIG. 11 illustrates a time-path diagram of a combined printer-punch system for parallel reception with hydraulic operation of the individual actutaing elements, in which the construction of the system is assumed to be in accordance with FIGS. 3 to 10. The actual displacement of the slide 13 takes place according to FIG. 1, with being the time which is available for the printing of a symbol, and being the time which is available for the revolution of the rotary slide valve 4. Under the time-path curves of the individual actuating elements there are represented the control channels for the pressure oil arranged on the circumference of the rotary slide valve 4. Channels not cross-hatched indicate the passage of pressure oil while cross-hatched channels represent the The figures appearing in front of the individual time-path diagrams are identical with the actuating parts illustrated in the preceding figures executing these paths in the duration of a revolution of the rotary slide valve. Reference numeral 49 designates the start impulses of beat impulses received by a sending system and the numeral 50 designates the code impulses received from the system.

FIG. 12 illustrates an arrangement of the slide 13, the pistons 15, 16 and the piston pairs 14 in connection with a hydraulic shock absorbing device. On both sides of slide 13 there is in each case arranged a damping piston 51, which is held in rest position by a spring 52. In a free chamber in the damping pistons there is situated oil which in movement of the damping piston escapes through a restricted port 53. Through this arrangement, the rebound of the setting pistons as well as the rebound of the actuating pistons 14, 15, 16 on slide 13 is damped.

FIGS. 13 and 14 illustrate an example of construction in which rotary setting of the type roller is accomplished by engagement of a projection mounted on a type roller shaft driven by a friction coupling or oil motor, on a stop selectively operated hydraulically.

From a tank 61, oil is conducted over a filter 62 by a gear pump 63. The oil runs over a pressure limiting valve 64 to a cam-controlled control slide 65, which directs it in the first oil pressure phase, through the control slides 66-71 set previously by the receiver, and passes to the pistons 72-77, which turn the selector rings 78-83 (according to plus or minus storing-in of thereceiver) clockwise or counterclockwise. The pressure oil passes parallel thereto over the control slides 66-71 to pistons 84-89, which shift the setting members 90-95 for the hole punch. The return oil from pistons 72-77 and 84-89 can there flow back over the control slides 66-71 to the tank 61. Over the cam-controlled control slide 65, the path for the first oil pressure phase is blocked and the path for the second oil pressure phase is released. Thereby the pressure oil passes to a U-shaped packing 96, whereby the selector rings 78-83 as well as spacing rings 97 are compressed with great force. The selector rings 78-83 have a number of holes which in a certain selector ring displacement form a through passage. Through the pressure oil one of a number of blocking pins 98-113 is urged outwardly. The type roller 122 is driven over a friction coupling (or oil motor) I123 and stopped by one of the hydraulically shockabsorbed levers arranged on the type roller by the pressedout blocking pen. For the axial shifting of the type roller 122 there is formed in the selector rings a second through opening so that the pressure oil of one of the four pistons 118-121 is actuable. The return oil of the counterpisto'n can escape over appertaining reversing valves 114-17. By means of the apparatus represented in FIGS. 6 and 7, sixteen radial and four axial type settings are possible.

Another cam-controlled control slide 125 shifts to the third oil pressure phase, while the second oil pressure phase is still in operation. Pressure oil thereby passes to two further pistons 126 for the operation of the holepunch needles and 127 for the tensioning of a pressure spring for the printing process. After this, the control slide 125 is shifted over to the fourth oil-pressure phase returning the pistons 126 and 127, in which process the piston 127 at the termination of all movements unlatches the tensioned pressure spring 128. The printing then takes place, with the type sleeve 122 stationary. For the next symbol, on shifting over of the control slide 65 for the new selector ring setting the blocking pin operated by the last symbol and the control valve are restored by spring force, in which process the return oil can escape over the continuous selector ring apertures and the control slide 65.

An extension of the apparatus to a system for the printing of 128 types is extremely simple. The number of selector rings is raised to seven and, since the type carrier is in this case axially shifted eight times, the number of control valves 114-17 and of pistons 118-121 is increased to nine each. In letter-digit shift-over, for example, the valves 114 and control a control slide, while in the subsequent symbol the second selection of the series is made by the valves 86 and 87.

Changes may be made within the scope and spirit of the appended claims which define what is believed to be new and desired to have protected by Letters Patent.

I claim as my invention:

1. Apparatus for the printing of received binary-coded information symbols, in which the energy required for the decoding and the printing of a symbol is transmitted by means of a fluid media under pressure, comprising a type carrier on which the symbols to be printed are arranged in predetermined relation in at least one of two coordinate directions, slide means operatively connected to said type carrier for moving the latter to effect a symbol selection thereon, means operatively connecting said type carrier and said slide means for transmitting movement therebetween, a plurality of pairs of pistons, such pairs being equal in number to the number of symbols arranged on said type carrier in such a coordinate direction, a plurality of stops, each cooperable with one of said pairs, the respective pistons of which are movable in opposite directions toward the cooperable stop, and arranged to transmit movement to said slide in a direction toward such stop, the latter being operative to restrict such movement of cooperable pistons, means operatively connecting the respective pairs of pistons to a fluid media under pressure, and decoding elements cooperable with said last-mentioned means for selectively controlling the flow of such fluid media to the respective pairs of pistons.

2. Apparatus according to claim 1, wherein the symbols on said type carrier are arranged in two coordinate directions, and the connecting means for said type carrier comprises a direct coupling with said slide means. I 3. Apparatus according to claim 1, wherein the symbols on said type carrier are arranged in two coordinate directions, and the connecting means for said type carrier comprises a transmission lever opcratively connecting said tly'pe carrier and said slide means.

4 Apparatus according to claim 1, wherein the symbols on said type carrier are arranged in two coordinate directions, and said slide means comprises a slide member for each coordinate direction of movement of said type carrier, each operative to move the latter in a respective coordinate direction.

5. Apparatus according to claim 1, comprising shockabsorbing pistons disposed between the slide means and the respective piston pairs.

6. Apparatus according to claim 1, wherein the decoding elements are indirectly settable by a fluid media controlled by receiver slides.

7. Apparatus according to claim 1, wherein a pressure channel extends between the decoding elements and each of the control pistons, from which there branches 011 a restricted channel leading to the fluid media supply tank, the surfaces of the control pistons on which the fluid media under pressure acts, when rendered active by the decoding elements, being greater than the surface on which the fluid media under pressure acts in resetting the control pistons into a rest position, the resetting of a control piston and the setting of another control piston taking place simulaneously, with the fluid media respectively acting thereon being under approximately equal pressure.

8. Apparatus according to claim 1, comprising receiver elements, the receiver slide or decoding element serving as a receiver slide being slidable by means of fluid media under pressure into the effective range of said receiver elements, which are operative to selectively retain a respective slide in predetermined position.

9. Apparatus according to claim 1, in connection with a hole punch mechanism, wherein the punch stamps thereof are operable over pistons operable by selector members actuated by fluid media under pressure, controlled by cooperable receiver slides.

10. Apparatus according to claim 1, in combination with a hole punch, wherein the pistons controlling the punch stamps are operable by fluid media under pressure, controlled over the decoding slide.

11. Apparatus according to claim 1, for the setting of a type roller in direction of rotation, wherein pistons are provided which are selectively slidable over the decoding elements by fluid media under pressure, and pins arranged in circular form around the shaft, driven over a slip coupling for the type roller, and in the path of a projection rigidly mounted on the shaft of the type roller.

12. Apparatus according to claim 1, wherein a rotatably supported slide, controlling the fluid media under pressure for the individual operations is controllable over an electromagnet energizable by impulses, and over a coupling which is operable by the electromagnet, by means of a valve which is actuatable by a drive assembly.

13. Apparatus according to claim 12, wherein a spring is operatively engageable with the armature of the electromagnet, acting in the same direction as the magnetic force of said magnet, and a piston actuatable in opposition thereto by fluid media under pressure controlled by the rotatably supported slide.

14. Apparatus according to claim 1, comprising a slidable control piston disposed in the transmission path between each pair of pistons and the decoding elements, said control pistons being slidable, in dependence upon the position of the decoding elements, by the fluid media under pressure, from a rest position into a position opening the pressure transmission path for the fiuid to the allocated pair of pistons.

15. Apparatus according to claim 2, wherein the control pistons are resettable by the fluid media into their rest position.

16. Apparatus according to claim 1, wherein that one or more slides, a-ctuatable by the receiver shaft are provided, by means of which the fluid media under pressure is made active in proper time sequence for the individual actuating parts of the apparatus.

17. Apparatus according to claim 16, wherein, for the control of the fluid media under pressure for the control pistons and the pairs of pistons a control channel is arranged in the slide.

18. Apparatus according to claim 16, wherein the pistons additionally operating the printing elements are operable by fluid media under pressure controlled over said slide.

19. Apparatus according to claim 16, wherein the pistons operating the punch stamps are operable by fluid media under pressure, controlled over a slide member.

20. Apparatus according to claim 16, wherein for the advance of the recording carrier, there are arranged pistons sliding in and against the advance direction, restricting the recording carrier after each symbol printing, which pistons are operable by fluid media under pressure controlled over said slide.

References Cited by the Examiner UNITED STATES PATENTS 543,164 7/1895 Weiss 19715 659,703 10/1900 Soblik 197-15 1,089,689 3/1914 Burbva 197-15 2,218,113 10/ 1940 Kleinschrnidt 19715 X 2,986,256 5/ 1961 Weaver 197-15 X 3,034,628 5/1962 Wadey 19715 X 3,122,039 2/1964 Sowers 19715 X OTHER REFERENCES Aweida et al.: I.B.M. Technical Disclosure Bulletin, vol. 6, No. 10, March 1964, pp. 15 and 16.

Grubb: I.B.M. Technical Disclosure Bulletin, vol. 6, No. 1, June 1963, pp. 24 and 25.

ROBERT E. PULFREY, Primary Examiner.

DAVID KLEIN, E. S. BURR, Assistant Examiners. 

1. APPARATUS FOR THE PRINTING OF RECEIVED BINARY-CODED INFORMATION SYMBOLS, IN WHICH THE ENERGY REQUIRED FOR THE DECODING AND THE PRINTING OF A SYMBOL IS TRANSMITTED BY MEANS OF A FLUID MEDIA UNDER PRESSURE, COMPRISING A TYPE CARRIER ON WHICH THE SYMBOLS TO BE PRINTED ARE ARRANGED IN PREDETERMINED RELATION IN AT LEAST ONE OF TWO COORDINATE DIRECTIONS, SLIDE MEANS OPERATIVELY CONNECTED TO SAID TYPE CARRIER FOR MOVING THE LATTER TO EFFECT A SYMBOL SELECTION THEREON, MEANS OPERATIVELY CONNECTING SAID TYPE CARRIER AND SAID SLIDE MEANS FOR TRANSMITTING MOVEMENT THEREBETWEEN, A PLURALITY OF PAIRS OF PISTONS, SUCH PAIRS BEING EQUAL IN NUMBER TO THE NUMBER OF SYMBOLS ARRANGED ON SAID TYPE CARRIER IN SUCH A COORDINATE DIRECTION, A PLURALITY OF STOPS, EACH COOPERABLE WITH ONE OF SAID PAIRS, THE RESPECTIVE PISTONS OF WHICH ARE MOVABLE IN OPPOSITE DIRECTIONS TOWARD THE COOPERABLE STOP, AND ARRANGED TO TRANSMIT MOVEMENT TO SAID SLIDE IN A DIRECTION TOWARD SUCH STOP, THE LATTER BEING OPERATIVE TO RESTRICT SUCH MOVEMENT OF COOPERABLE PISTONS, MEANS OPERATIVELY CONNECTING THE RESPECTIVE PAIRS OF PISTONS TO A FLUID MEDIA UNDER PRESSURE, AND DECODING ELEMENTS COOPERABLE WITH SAID LAST-MENTIONED MEANS FOR SELECTIVELY 